Telegraph-transmitter attachment



C.F.GRUETTER.

TELEGRAPHTTRANSMITTER ATTACHMENT. APPLICATION FILED FEB. 12. 1921.

1,438,107; Patented Dec. 5,1922.

ATENT oFr cE.

CORNELIUS r. enun'rrnn, or SAN FRANCISCO, onnrroniua.

TELEGRAPH-TRANSMITTER ATTACHMENT.

Application filed February 12, 1921. Serial No. 444,429.

To all whom it may concern:

Be it known that I, CORNELIUS F. GRUET- TER, a citizen of the United States, residing at San Francisco, in the county of San Fran,

cisco and State of California, have invented new and useful Improvements in Telegraph- 'Iransmitter Attachments, of which the following is a specification.

This invention relates to improvements in telegraph transmitters, and has particular reference to a spring contact device for use on an instrument of the above mentioned character.

The principal object of this invention is to provide an attachment of this nature which consists of a'plurality of laminated spring elements so constructed that resistance is reduced and so made, of difierent materials, that a long, heavy and intimate contact is furnished.

Another object of this invention is to provide an attachment of the character described, which will be simple, compact, strong, durable and adaptable for use on various types of instruments.

Other objects and advantages of this invention will be apparent during the course of the. following description In the accompanying drawings forming part of this specification, and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a top plan view of a transmitter showing my attachment thereto,

Figure 2 is a detail side elevation of'my attachment on an enlarged scale showing means for supporting the attachment and the points of contact, and

Figure 3 is a perspective view of a plurality of spring elements which for the purpose of illustration are disengaged one from the other.

The present invention is an improvement on the telegraph transmitter set forth in the atent to H. G. Martin, No. 842,154, dated Banuary 22nd, 1907. For the purpose of setting forth my improved attachment, I have shown the application of the same to the above mentioned patented transmitter, and for the purpose of illustration I have here'- applied with shown and described by numerals a collar 5 embracing a vibrator or pendulum 6 and a stationary contact 7. These elements as. well as the other structure shown but not described, do not enter into my invention.

In my improvement wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numerals 8, 9 and 10 designate a plurality of U-shaped leaf spring pieces, which are adapted to be superimposed one upon the other in laminated form and having their free ends 11, suitably mounted in the collar 5, while the opposite ends 12 are riveted at 13 andhave provided adjacent their extremities a moveable contact point 14, preferably made of either tungsten or silver, which point lies opposite but spaced slightly from the stationary contact 7 The spring contacts 8 and 10 are made of steel, while the intermediate spring 9 is composed of copper. By employing U- shaped leaf springs of these respective materials it. has been proven by actual test that when the dots or short impulses are sent to distant receiving instruments, upon the maklng and breaking of the circuit at contacts 14 and 7, the contacts will be stronger, longer and more intimate than if a single U- shaped spring cont-act were employed.

It is to be understood that the form of my invention herewith shown and described,- is to be taken as a preferred example of the same, andthat various changesin the size,

' plurality and arrangement of the U-shaped spring elements may be made without departing from the invention.

Having thus described my invention, I 

